I have a content platform (medical app) where our clients create or upload a significant percentage of the content.

Although markdown has its limitations, as well as a barrier to entry for the non-technical user, it enables us to make sure our content is uniform in appearance with minimal style guides. A good markdown table editor would be a real winner, and some f the better open source editors don't have a consistent set of features, so it is often s bit of a trade off determining what is best.